Class 10 Light Reflection And Refraction CBSE Questions & Answers

Class 10 · Light Reflection And Refraction

Class 10 Light–Reflection and Refraction CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
An object of size 2.5 cm is kept perpendicular to the principal axis of a concave mirror. The distance of the object from the pole of the mirror equals the radius of curvature of the mirror. The size of the image formed is
  • A
    5.0 cm
  • B
    1.25 cm
  • C
    3.5 cm
  • D
    2.5 cm
    Correct
2
The image of a bright object is brought on a screen with the help of a concave mirror. If the upper half of the concave mirror is covered, the effect on the image will be
  • A
    the image disappears
  • B
    brightness reduced
    Correct
  • C
    its size becomes half
  • D
    image changes position
3
For experimentation, the principal axis of the lens should be
  • A
    anywhere, it hardly matters.
  • B
    inclined at angle of \({\rm{4}}{{\rm{5}}^0}\) to the length of optical bench
  • C
    parallel to the length of the optical bench
    Correct
  • D
    normal to the length of the optical bench
4
Magnification for a plane mirror is m = +1 what does this signify for m = 1
  • A
    m = 1, signifies that the image is of diminished size.
  • B
    m = 1, signifies that the image is of the same size as the object
    Correct
  • C
    m = 1, signifies that the image is of the bigger size as the object
  • D
    m = 1, signifies that the image is of the smaller size as the object
5
The nature of image is not affected by the position of the object is-
  • A
    Concave mirror
  • B
    Plane mirror
  • C
    Convex mirror
  • D
    Both Plane mirror and Convex mirror
    Correct
6
A spherical mirror and thin spherical lens have each a focal length -15 cm.
  • A
    The mirror is convex, but the lens is concave.
  • B
    Both are concave
    Correct
  • C
    The mirror is concave, but the lens is convex.
  • D
    Both are convex
7
No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be.
  • A
    concave
  • B
    Either plane or convex
  • C
    plane
  • D
    convex
    Correct
8
When two lenses of powers +4D and -3D are placed in contact, the power of the resultant lens is
  • A
    +1D
    Correct
  • B
    7D
  • C
    -1D
  • D
    None of the above
9
A sharp image of a distant object is obtained on a screen by using a convex lens In order to determine the focal length of the lens, you need to measure the distance between the
  • A
    object and the screen
  • B
    lens and the screen
    Correct
  • C
    lens and object
  • D
    lens and the screen and also object and the screen
10
At the point of emergence, the angle of emergence is measured with respect to the
  • A
    edge of the slab
  • B
    normal at the point of emergence
    Correct
  • C
    direction of the refracted ray
  • D
    direction of incident ray
11
In a glass slab with parallel faces, refraction occurs
  • A
    at two opposite sides only
    Correct
  • B
    at one side only
  • C
    on all its sides
  • D
    at three of its sides
12
The extent to which a ray of light travelling in one medium and entering the second medium bends depends on the
  • A
    none of the above
  • B
    speed of light
    Correct
  • C
    frequency of light
  • D
    wavelength of light
13
The lateral displacement of an incident ray passing out of a rectangular glass slab
  • A
    none of the above
  • B
    inversely proportional to the thickness of the glass slab
  • C
    independent of the thickness of the glass slab
  • D
    is directly proportional to the thickness of the glass slab
    Correct
14
The difference between angle of incidence and angle of emergence is
  • A
    \({\rm{6}}{0^0}\)
  • B
    \({0^0}\)
    Correct
  • C
    \({\rm{18}}{0^0}\)
  • D
    \({\rm{9}}{0^0}\)
15
Sanjay is standing at a distance of 2m in front of a plane mirror. The distance between Sanjay and his image will be
  • A
    3m
  • B
    2m
  • C
    4m
    Correct
  • D
    6m